Valve.



J. D. ROBERTSON.

VALVE.

APPLICATION FILED DBO. 21, 1909.

Patented Oct. 17, 1911.

WITNESSES ATTORNEYS UNITED STATES PATENT onnicn.

JAMES D. ROBERTSON, 0F CANTON, ILLINOIS.

VALVE.

Specification of Letters Patent.

'0 all whom it may concern: I

Be it known that I, JAMES D. ROBERTSON,

' check valves.

The object of the invention is to provide a float-actuated valve which is freely mov-' able within a cage and adapted to seat over and close an outlet formed within a plug, the plug having an approximately hemispherical seat, and the valve having a head of like form and size to bear, against the seat, and approximately equal in diameter to the internal diameter of the cage, whereby a relatively large bearing surface between the valve and the'seat is aiforded.

Reference is to be had to the accompanying drawings forming a part of this speci-' fication, in which sim1lar characters of referenceindicate corresponding parts in all In the accompanying drawing I- have shown a float valve embodying my improvehaving a convex seating end, shown to be approximately he herical, with an extended cylindrical.

y portion 10*, and arranged to pass within a counterpart seat 11, formed within an externally screw-threaded plug 12, the latter having a pipe connection 13. The valve head is of thimble form and fits over and is secured to a cylindrical float 14 filled with some buoyant material, as

Patented Oct. 17, 1911.

Application filed December 21, 1909. Serial No. 534,336.

cork 15, to cause the valve to float in water.

lation of air and steam, the valve obviously The rising and being forced tight to its seat by the rise of the liquid leve 7 Having thus described my invention, I claim as new and desire to secure by-Letters Patent:

A valve comprising a screw threaded plughavinga heml-spherical valve seat on its inner face, anopening leading frpm the seat through the top, and a pipe connection registerin with said. opening, a' cage formed of a p urality of members projecting .from the lower face of the plug, an elongated cy lindrical float in the cage, and a hollow hemi-spherical head on the upper end of the apted to seatfloat and forming a valve a in the seat ofthe said plug.

- In testimony whereof I have signed my name to this specification in the presence pf two subscribing witnesses. ment, the same comprising a valve head 10- JAMES D. ROBERTSON. Witnesses: I

P. S. Sonoms,

H. G. Mom. 

